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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: "Ronald Tschalär" <ronald@innovation.ch>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Sergiu Cuciurean <sergiu.cuciurean@analog.com>,
	Lee Jones <lee.jones@linaro.org>,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] Input: applespi: Add trace_event module param for early tracing.
Date: Wed, 17 Feb 2021 12:26:18 -0800	[thread overview]
Message-ID: <YC176rlGQeyKuOpn@google.com> (raw)
In-Reply-To: <20210217190718.11035-3-ronald@innovation.ch>

Hi Ronald,

On Wed, Feb 17, 2021 at 11:07:18AM -0800, Ronald Tschalär wrote:
> The problem is that tracing can't be set via sysfs until the module is
> loaded, at which point the keyboard and trackpad initialization commands
> have already been run and hence tracing can't be used to debug problems
> here.
> 
> Adding this param allows tracing to be enabled for messages sent and
> received during module probing. It takes comma-separated list of events,
> e.g.
> 
>   trace_event=applespi_tp_ini_cmd,applespi_bad_crc

You can unbind and rebind a device to a driver via sysfs as many times
as needed (see bind and unbind driver sysfs attributes), so I believe

Thanks.

-- 
Dmitry

  reply	other threads:[~2021-02-17 20:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-17 19:07 [PATCH 1/3] Input: applespi: Don't wait for responses to commands indefinitely Ronald Tschalär
2021-02-17 19:07 ` [PATCH 2/3] Input: applespi: Fix occasional crc errors under load Ronald Tschalär
2021-02-19 19:12   ` Dmitry Torokhov
2021-02-17 19:07 ` [PATCH 3/3] Input: applespi: Add trace_event module param for early tracing Ronald Tschalär
2021-02-17 20:26   ` Dmitry Torokhov [this message]
2021-02-17 20:52     ` Life is hard, and then you die
2021-02-17 21:06       ` Dmitry Torokhov
2021-02-17 22:34         ` Life is hard, and then you die
2021-02-18  0:18   ` kernel test robot
2021-02-18  0:18     ` kernel test robot
2021-02-18  4:41   ` kernel test robot
2021-02-18  4:41     ` kernel test robot
2021-02-17 20:23 ` [PATCH 1/3] Input: applespi: Don't wait for responses to commands indefinitely Dmitry Torokhov
2021-02-17 20:45   ` Life is hard, and then you die
2021-02-19 19:12     ` Dmitry Torokhov

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